import java.util.Scanner;

public class Day_27_2_三角形 {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        while(scan.hasNextInt()) {
            int a = scan.nextInt();
            int b = scan.nextInt();
            int c = scan.nextInt();

            if((a + b > c) && (a + c > b) && (b + c > a)) {
                System.out.println("Yes");
            }else {
                System.out.println("No");
            }
        }
    }
}

